Device and method for coating workpieces

Abstract

A device for coating workpieces preferably consisting at least in parts of wood, wood materials, plastic, aluminium or the like, comprises: a feed device for feeding a coating material; a pressing device for pressing the coating material onto a surface of a workpiece; a conveying device for inducing a relative movement between the pressing device and the respective workpiece; and an activation device for activating an adhesive on a coating material fed in the feed device and/or for activating an adhesive on a surface of a workpiece to be coated. The activation device comprises at least one supply line for supplying an activation medium as well as a nozzle body having an inlet duct and an outlet region. The activation device comprises at least one acoustic element that is configured to reduce the sound pressure resulting from the flow of the activation medium and/or to effect a frequency shift.

1 . Device for coating workpieces comprising a feed device for feeding a coating material; a pressing device for pressing the coating material onto a surface of a workpiece; a conveying device for inducing a relative movement between the pressing device and the respective workpiece; and an activation device for activating an adhesive on a coating material fed in the feed device and/or for activating an adhesive on a surface of a workpiece to be coated, said activation device comprising at least one supply line for supplying an activation medium as well as a nozzle body having an inlet duct and an outlet region,
 wherein the activation device comprises at least one acoustic element that is configured to reduce the sound pressure resulting from the flow of the activation medium and/or to effect a frequency shift.   
     
     
         2 . The device according to  claim 1 , wherein the at least one acoustic element is configured as a sound-absorbing element and/or as a resonator. 
     
     
         3 . The device according to  claim 1 , wherein the acoustic element is arranged at at least one of the locations: supply line of the activation device; inlet duct of the nozzle body; or outlet region of the nozzle body. 
     
     
         4 . The device according to  claim 1 , wherein the activation device comprises at least one activation medium heating device and/or at least one activation medium cooling device and/or an activation medium discharge duct, wherein the acoustic element is arranged in the activation medium heating device, the activation medium cooling device and/or the activation medium discharge duct. 
     
     
         5 . The device according to  claim 1 , wherein the acoustic element comprises a single-layer or multi-layer fabric. 
     
     
         6 . The device according to  claim 1 , wherein the acoustic element comprises a honeycomb structure. 
     
     
         7 . The device according to one  claim 1 , wherein the acoustic element comprises a plurality of grid elements which together form a grid structure with openings, wherein a grid element is formed by parallel displacement of a planar cross-section perpendicular to the cross-sectional plane, and wherein a first plurality of grid elements forms an angle of between 20° and 90°, relative to a second plurality of grid elements. 
     
     
         8 . The device according to  claim 7 , wherein the grid elements comprise notches which are configured such that grid elements that are each angled relative to each other can be inserted into each other. 
     
     
         9 . The device according to one of  claim 7 , wherein the grid elements that are each angled relative to each other are connected to one another with a force fit, form fit and/or cohesive fit. 
     
     
         10 . The device according to  claim 7 , wherein the planar cross-section comprises a round portion and a pointed portion substantially opposite thereto. 
     
     
         11 . The device according to  claim 7 , wherein a plurality of grid structures are stacked such that the openings thereof are at least partially aligned with one another and/or at least partially offset from one another and/or rotated relative to each other. 
     
     
         12 . The device according to  claim 1 , wherein the acoustic element comprises a plurality of spatial substructures, which are arranged in a substantially primitive cubic, body-centred cubic, face-centred cubic or hexagonal close-packed packing. 
     
     
         13 . The device according to  claim 1 , wherein the acoustic element comprises a plurality of streamlined bodies, wherein a streamlined body comprises a substantially hemispherical end and a pointed end opposite thereto, wherein a streamlined body axis extends through said hemispherical end and said pointed end, and wherein said streamlined body axes of all streamlined bodies of the acoustic element are arranged such that they are substantially parallel. 
     
     
         14 . The device according to  claim 1 , wherein the acoustic element comprises a plurality, at least two, of the structures:
 grid structure with openings;   honeycomb structure with openings;   single-layer or multi-layer fabric with openings;   sintered structure with openings;   random fibre structure with openings;   an array of spatial substructures, arranged in a substantially primitive cubic, body-centred cubic, face-centred cubic or hexagonal close packed packing, wherein the regions in the array of substructures in which no substructures are formed define openings;   an array of streamlined bodies, wherein a streamlined body comprises a substantially hemispherical end and a pointed end opposite thereto, wherein a streamlined body axis extends through said hemispherical end and said pointed end, wherein the streamlined body axes of all streamlined bodies of the acoustic element are arranged such that they are substantially parallel, and wherein the regions in the array of streamlined bodies in which no substructures are formed define openings;   wherein the structures are stacked such that the openings thereof are at least partially aligned with one another and/or at least partially offset from one another and/or rotated relative to each other.   
     
     
         15 . The device according to  claim 1 , wherein the acoustic element or parts of the acoustic element are made of a metal and/or a ceramic material that is suitable for continuous use at temperatures of up to 900° C. 
     
     
         16 . The device according to  claim 1 , wherein the acoustic element is formed by a casting process, a sintering process or an additive manufacturing process. 
     
     
         17 . The device according to  claim 1 , wherein the acoustic element comprises an inner conduit having an axis and an outer conduit arranged substantially concentric to said axis, said outer conduit having a larger cross-section than said inner conduit, said inner conduit and said outer conduit overlapping in a first length region, wherein the inner conduit is open at a first end and closed at an end substantially opposite thereto, and wherein the outer conduit is open at a second end and closed at an end substantially opposite thereto, wherein the inner conduit has through-holes in its lateral surface that are configured to bring the first end into fluidic connection with the second end, and wherein a sound-absorbing material is arranged in the first length region. 
     
     
         18 . The device according to  claim 13 , wherein the sound-absorbing material is arranged on the inner surface of the outer conduit, wherein a plurality of structures tapering substantially in the direction of the conduit axis are formed on a side of the sound-absorbing material facing the conduit axis, and wherein the sound-absorbing material is porous. 
     
     
         19 . The device according to  claim 1 , wherein the acoustic element arranged in the inlet duct of the nozzle body and/or the acoustic element arranged at the outlet region of the nozzle body attached to the nozzle body with a force fit, a form fit and/or a cohesive fit. 
     
     
         20 . The device according to  claim 1 , wherein
 the acoustic element arranged in the inlet duct of the nozzle body and/or the acoustic element arranged at the outlet region of the nozzle body configured integrally with the nozzle body.   
     
     
         21 . The device according to  claim 1 , wherein the acoustic element arranged in the supply line of the activation device is connected to the supply line with a force fit, a form fit and/or a cohesive fit. 
     
     
         22 . The device according to  claim 1 , wherein the acoustic element arranged at the outlet region of the nozzle body is recessed in the nozzle body in a flush-mounted manner. 
     
     
         23 . The device according to  claim 3 , wherein
 the mesh size of the fabric and/or grid structure is less than the value 5000 μm.   
     
     
         24 . Method for coating and/or activating workpieces using a device according to  claim 1 , said method comprising the steps of:
 inducing a relative movement between the pressing device and the respective workpiece by means of the conveying device;   feeding the coating material by means of the feed device; and   applying and/or activating an adhesive on a coating material fed in the feed device and/or a surface of a workpiece to be coated by means of the activation device.   
     
     
         25 . Method for coating and/or activating workpieces using a device according to  claim 1 , said device comprising at least one sensor for measuring a measurement parameter, said method comprising the steps of:
 measuring a measurement parameter; and   changing a working parameter of a processing machine based on the measured measurement parameter.   
     
     
         26 . The method according to  claim 25 , wherein the measurement parameter is a temperature, an atmospheric pressure, a sound pressure, a sound frequency, a fluid viscosity or a Reynolds number, and wherein the working parameter is a feed rate, a flow rate, a heating/cooling power and/or an activation energy.